Yesterday, the boiler started playing up. Apparently, the heating would come on fine but then as soon as hot water tap was turned on the boiler would pack in and the system overheat button would pop out.

Then, heating was left on and mum tried her best not to use the hot water; however dad woke up and turned the tap on and since then we can't get the heating to come on or hot water to come on without the boiler packing in.

I've looked through the manual and got to fault finding so i got my multimeter out. I've tried testing parts as stated in the manual but the boiler won't stay on long enough to carry on testing.

The manual asks "is the pump running?" and I don't think it is cos when we get the boiler to come on and then we hear like a sizzling sound. This leads me to believe that the pump isn't working but I need to make sure. What's bugging me is is that when I touch the pump it's stinging hot at times [i]and[/i] this is when the boiler has packed in??

Well, that's all I can think of at the moment; has anyone any ideas so far?

sounds like it may be the diverter valve sticking, when the boiler is on central heating - feel the hot water draw off pipe from the boiler- if this gets hot then the diverter valve isn't switching across fully.

It could aslo be the pump as the boiler will cut out if it overheats as a safety precaution. The pump shouldn't get mad hot. Do the radiators heat up ok ?

When the boiler has packed up and when I open the plated screw sometimes it is running and sometimes it is not.

I drained the boiler circuit and removed the pump. I then wired it up to a mains plug and plugged it into the mains. It ran fine on all three speeds; however on the number 1 and 2 settings it was evident that there was a faulty bearing and number 3 setting ran smoothly.

My instinct is still telling me that it is the pump as well but I've got a little bit of doubt that's all.

Is there anything else I can check before going for another pump.

We are in the middle of ringing around for a pump so fingers crossed :roll:

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